Little is known about the company. Founded in October 2024,[1] the company excelled in technology exploiting small caliber rounds packing the punch of much bigger caliber rounds. Seburo jumped into the forefront through reliable rapid fire and easily handled firearms.[2]

Shirow frequently attributes the Seburo name to advanced, high-velocity, small-caliber weapons, similar in concept to firearms using 5.7x28mm SS190 and 4.6x30mm cartridges.[1] Various models appear in works done by Shirow, usually identified by large SEBURO markings placed on either the gun's slide mechanism, body,[3] or on other accessories like Ammo cans.[4]

Bobson: A small-framed handgun. Deunan Knute owns a Seburo Bobson 100th Anniversary Model with a 23 rd. capacity magazine. It fires a 6x25mm cartridge but can also be re-chambered for a 4.2mm cartridge and a 5mm cartridge.[1][7]

Cento (100mm) Master: A bullpup looking weapon utilizing the magazine feeding system of the FN P90.[8]

Compact eXploder (CX): A bullpup pistol loosely based on the frame of a Walther PPK/S, with ammo feed similar to a P90. The bullpup design allows the weapon to take advantage of a longer barrel.[9][10]

MN-23: A 5.56 mm bullpupassault rifle originally designed as an airsoft gun for Moon Net Co. Shirow designed it as a fusion of the FN P90 submachinegun and FAMAS assault rifle.[13] Designated the MN-23 due to Shirow creating 23 separate concept designs before finalization of the final version of the gun.[14] Sidearm of the Newport Police Department in Dominion. Capable of firing lethal and non-lethal rounds, tracking bullets, and gas rounds. Comes with a flashlight, built in knife and camera that activates upon pressing of the trigger.[15]

C-25a: A small PDW which fire a 6x25mm cartridge from a fifty-round magazine in a bullpup configuration. It ejects upwards and is often depicted with a brass catcher. In addition, it features an integral laser sight.

C-26a: A machine pistol which serves as a smaller counterpart to the C-25a. It fires the same 6x25mm cartridge and feeds from a fifty-round magazine in a bullpup configuration. Similar to the C-25a, it also mounts a top mounted brass catcher, which can hold one magazine's worth of spent brass before needing to be replaced.

M-5: A handgun used as a sidearm by Section 9 operatives, mostly seen in use by Motoko Kusanagi. It is classified as an SA/DA concealed handgun with a 3.5 inch barrel and a rotating breech locking mechanism similar to that of the Beretta 8000 and firing the Russian made 5.45×18mm cartridge from a twenty round double stack magazine.[16][17]

C-26A: A bullpup, rifle calibre personal defence weapon used by Section 9 operatives needing more firepower. It fires a 5.45x45mm cartridge from a long fifty-round magazine and has an appearance similar to the FN F2000. It can be fitted with a two-stage suppressor attachment and has a built in visible/IR laser sight.[18]

C-30: A bullpupassault rifle used when by Section 9 when greater firepower is required than the C-26A can provide. It features an extended barrel, integral scope and a grenade launcher but is otherwise similar to the C-26A. It is often seen with jacketing.